100% plagiarism free. The Brain; Helper; Not sure about the answer? Click on the buttons below to see examples of polymer structures. Which of the following fibres is made of polyamides? 1:50 2.7k + Eg:- Bakellite, Urea, Formaldehyde, Resin, etc . raje47 raje47 Explanation: an example of stepgrowth polymer is polybutadiene. Answer: Explaination: Bakelite. Bakelite, Polystyrene, Urea-formaldehyde resin. Let us know if you have suggestions to improve this article (requires login). Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Phenol-formaldehyde resins are heat-resistant and waterproof, though somewhat brittle. Popular Questions of Class 12th chemistry . Polymers have been essential components of commodities since the early days of humankind. Then it becomes permanently hard and rigid when cooled. This article was most recently revised and updated by, https://www.britannica.com/science/Bakelite. It is a linear, unbranched polymer of tetrafluoro ethylene. Our latest episode for parents features the topic of empathy. Answer: (c) Cellulose. Our editors will review what you’ve submitted and determine whether to revise the article. They are those polymers … Bakelite is used to manufacture sockets and electrical devices. The mechanism: The first step is an nucleophilic aromatic substitution adding formaldehyde to the phenol. These new plastics could be used to produce household products in virtually any hue and in varying degrees of clarity. This made it the first truly synthetic resin, representing a significant advance over earlier plastics that were based on modified natural materials. In 1927 the Bakelite patent expired. SR Questions; 1: Which one of the following class of compounds is obtained by polymerization of acetylene? A thermosetting plastic, also known as a thermoset, is a polymer material that irreversibly cures. Write the names and structures of the monomers of the following polymers : (i) Buna-S (ii) Dacron (iii) Neoprene (All India 2011) Answer: Question 35. Omissions? Nylon – 6,6. These include cellulose, lignin, and various resins. It has very high thermal stability. When the phenol is taken in excess and the reaction medium is made acidic, the product of the condensation reaction obtained is acidic. Nylon is used in fabrics and toothbrushes. Bakelite is the condensation polymer of (A) C6H5OH and caprolactum (B) HCHO and phthalic acid (C) C6H5OH and HCHO (D) HCHO and ethylene glycol. These polymers are cross linked or heavily branched molecules, which on heating undergo extensive cross linking in moulds and again become infusible. Answer. Which of the following is a polyamide? It is a thermosetting plastic. This phenol-formaldehyde resin is a thermosetting polymer. Bakelite is a condensation polymer of phenol and formaldehyde. It is copolymer and has ester linkage. In 1909 Baekeland made the first public announcement of his invention, in a lecture before the New York section of the American Chemical Society. Owing to its low electrical conductivity, bakelite is resistant to electric current. Alcohol; Carboxylic acids; Water; Examples of Polymers Natural polymers. Email. These plastics cannot be softened again on heating. Polymer obtained by condensation polymerization is 1) Polythene 2) Teflon 3) Phenol-formaldehyde 4) Nitrile rubber 2. The catalyst used in the manufacture of polythene by Ziegler method is Updates? Bakelite is an example of (a) fibre (b) elastomer (c) nylon (d) thermosetting polymer. Your time is important. We cannot deny the presence of polymers in our lives. Chec Polyvinyl Chloride is: PVC and is the third-most widely produced synthetic plastic polymer, including for old records. A hard, infusible, and chemically resistant plastic, Bakelite was based on a chemical combination of phenol and formaldehyde (phenol-formaldehyde resin), two compounds that were derived from coal tar and wood alcohol (methanol), respectively, at that time. Bakelite. The condensation reaction of the two reactants in a controlled acidic or basic medium results in the formation of ortho and para hydroxymethyl phenols and their derivatives. 225 Views. In a plastics market virtually monopolized by celluloid, a highly flammable material that dissolved readily and softened with heat, Bakelite found ready acceptance because it could be made insoluble and infusible. Q:-Give simple chemical tests to distinguish between the following pairs of compounds. Join BYJU’S or download our app to know more about polymers with the most simplified approach of learning. 67. Answer. The monomers themselves might be varied; for example using a substituted phenol (like p-chlorophenol), or using acetaldehyde in place of formaldehyde. (a) Protein (b) Fructose (c) Cellulose (d) Polyester . Answer. A thermosetting plastic is a plastic that liquefies and is malleable when heated. Union Carbide sold the trademark in 1992 to the Georgia-Pacific Corporation, which employed Bakelite as a bonding agent for plywood and particleboard. polystyrene. In the 1930s cast Bakelite, along with many other competing phenolic resins, enjoyed a vogue in colourful costume jewelry and novelties. Examples include polythene, polystyrene. Bakelite is a polymer made up of the monomers phenol and formaldehyde. Example : Bakelite, Melamine etc. D. All of the above. They are further used for protective purposes as well as in the coating industry. Polyacrylonitrile is an example of (a) addition polymer (b) condensation polymer (c) natural polymer (d) None of these. Bakelite is the first synthetic plastic and is known as a “material of thousand uses” due to its versatile applications. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Condensation polymers: A polymer formed by the condensation of 2 or more than 2 monomers with the elimination of simple molecules like water,ammonia is called condensation polymer. Polymer molecules are associated by strong dipole-dipole attraction. Draw the structures of the monomers of the following polymers : (i) Polythene (ii) PVC (iii) Teflon (All India 2011) Answer: (ii) (iii) Question 34. The monomers used are lactic acid and glycolic acid. Which of the following represents the example of homopolymer? Add your answer and earn points. Answer. These cannot be reused. Thus, it can be used to make a variety of items. Click hereto get an answer to your question ️ Which one of the following is an example of a thermosetting polymer? large molecule or a macromolecule which essentially is a combination of many subunits The preparation of bakelite involves several steps, as illustrated below. Bakelite is one of the earliest commercial plastics. It was Baekeland who succeeded in controlling the phenol-formaldehyde condensation reaction to produce the first synthetic resin. Out of chain growth polymerisation and step growth polymerisation, in which type will you place the following. 2: Polymer used in bullet proof glass is: 3: Which of the following is a condensation homopolymer? It does not conduct electricity. Which is an example of thermosetting polymer? This phenol-formaldehyde resin is a thermosetting polymer. The cure may be induced by heat, generally above 200oC(392 F), through a chemical reaction or suitable irradiation. [6] Bakelite was the first truly synthetic, as well as the first commercially produced, synthetic resin. It is one of the most common and important polymers that are used to make different parts of many objects. These polymers are formed when linear polymeric chains are connected together to make up a three dimensional network structure. For general molded parts, wood flour was preferred, but, where heat resistance, impact strength, or electrical properties were involved, other fillers such as cotton flock, asbestos, and chopped fabric were used. Question 11. Remember: This is just a sample from a fellow student. Its chemical name is polyoxybenzyl methylene glycol anhydride. Polyethylene - bottles, cups, electrical insulation, packaging . 5. Bakelite is a polymer made up of the monomers phenol and formaldehyde. For example, the solid parts of all plants are made up of polymers. All of the above. Bakelite moldings are heat-resistant and scratch-resistant. They are also resistant to several destructive solvents. (a) PMMA (b) Nylon- 6, 6 (c) Dacron (d) Bakelite. Because of its excellent insulating properties, Bakelite was also the first commercially produced synthetic resin, replacing shellac and hard rubber in parts for the electric power industry as well as in home appliances. These are one of the oldest polymers that were synthesized by man. B. Nylon – 6,6. Magnesium can be significantly strengthened by cold work.t/f. Question 14. Which of the following is not a limitation of magnesium and magnesium alloys? Dextron is a polyacetic acid polyglycolic acid polymer. It is a phenol formaldehyde resin, formed from condensation reaction of phenol and formaldehyde Newest Questions. Examples include Nylon (a polyamide), Dacron (a polyester), Bakelite, and polyurethane foams. Examples of thermosetting plastics include bakelite, urea-formaldehyde resins. In the growing consumer market of the 1930s and after, Bakelite faced competition from other thermosetting resins such as urea formaldehyde and melamine formaldehyde and from new thermoplastic resins such as cellulose acetate, polyvinyl chloride, polymethyl methacrylate, and polystyrene. Very smooth molding can be obtained from this polymer. Fully synthetic polymers include: Bakelite, the first synthetic plastic Neoprene (a manufactured form of rubber) Nylon, polyester, rayon (manufactured forms of silk) By 1910 Baekland had a semicommercial production operation established in his laboratory, and in 1911 General Bakelite began operations in Perth Amboy, N.J., U.S. Bakelite is still commonly used for dominoes, mah-jongg tiles, checkers, and chess pieces. a. Teflon b. PVC c. Polybutadiene d. Bakelite 1 See answer piyushwavhal is waiting for your help. Key Difference – Bakelite vs Plastic Plastic and Bakelite are both organic polymers, having a very large molecular weight though there exists a difference between the two based on their properties and usage. For the making of laminated structures, sheets of paper or fabric were impregnated with the resin in an alcohol solution and then heated under pressure to form tough, rigid assemblies. The A resin (resol) could be made directly into a usable plastic, or it could be brought to a solid B stage (resitol) in which, though almost infusible and insoluble, it could still be ground into powder and then softened by heat to a final shape in a mold. Chemically, thermoset plastics are cross-linked polymers. They are formed through the reaction of phenol with formaldehyde, followed by cross-linking of the polymeric chains. Bakelite is the trade name for phenol formaldehyde resin. A hard, infusible, and chemically resistant plastic, Bakelite was based on a chemical combination of phenol and formaldehyde (phenol-formaldehyde resin), two compounds that were derived from coal tar and wood alcohol (methanol), respectively, at that time. 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Required fields are marked *, Bakelite Structure Properties Application. In general, phenol taken in excess acts as the cross-linking agent. 1) Dacron 2) Orlon 3) … C) A Branched Polymer. When made with this procedure, it is often an amber clear solid. 1) Polythene 2) PVC 3) Neoprene 4) Bakelite 3. Moreover, the resin would tolerate considerable amounts of inert ingredients and therefore could be modified through the incorporation of various fillers. Phenol is made to react with formaldehyde. Which of the following is non-biodegradable? Not sure about the answer? Bakelite is one example of a thermosetting polymer. Terylene, bakelite . PF resin is formed when molecules of phenol (C. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. There are several variables in the method of polymerization, depending on the properties desired. Your email address will not be published. Lignin consists of a complicated three-dimensional network of polymers. Initial methods of preparing bakelite involved the heating of formaldehyde and phenol in the presence of one of the following catalysts -zinc chloride (ZnCl2), hydrochloric acid (HCl), or ammonia (NH3). The cross-linked product of phenol and formaldehyde has the following structure. Further, Bakelite has been used for making the handles of a variety of utensils. Rubber; Paper or cloth; Starch (potato) Wood; RNA and DNA; Semi-synthetic polymers. Now coming to the uses of Bakelite, since this element has a low electrical conductivity and high heat resistance it can be used in manufacturing electrical switches and machine parts of electrical systems. Some common examples are bakelite… Vulcanized rubber ; Nitrocellulose; Synthetic polymers. POLYMERS LIKE POLYSTERS, BAKELITE, RUBBER, BIODEGRABLE AND NON-BIODEGRABLE POLYMERS 1. 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